Several advantages result from having a plan for data analysis before starting the study. The most obvious is that
the investigators are not left wondering what to do with all of the data they now have in their computer. A plan speeds
the process of data analysis. If a computer program will be used, the commands for the analysis can even be written
before data collection is complete. In this case, as soon as all of the data are entered, the investigators run the predetermined programs, and the analysis is ready for interpretation.